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AMD today launched the AMD Radeon HD 7990, the world's
fastest graphics card powered by two GPUs and designed for
gamers who want to take their PC gaming experience to the
highest level.

Based on AMD Graphics Core Next (GCN) architecture with AMD
Eyefinity technology, the AMD Radeon HD 7990 graphics card
promises to deliver unrivaled performance for playing the
latest DirectX 11 games in extreme resolutions and
multi-monitor configurations.

By combining two of the world's most advanced GPUs with 6GB
of GDDR5 memory, AMD Radeon HD 7990 is the world's fastest
graphics card. It supports up to six simultaneous displays
with AMD Eyefinity technology and is the ideal graphics card
for gaming on Ultra HD displays (4K resolution). At 100%
utilization, AMD Radeon HD 7990 GPU's quiet
triple-fan cooler is more silent than a typical library.

The new card enables gaming enthusiasts to play the latest
PC games at maximum settings: for instance "Tomb Raider"
with TressFX Hair enabled, or the "Crysis 3" in 4K
resolution.

AMD GPU comparison

AMD Radeon HD 7990

AMD Radeon HD 7970 GHz Edition

AMD Radeon HD 7970

AMD Radeon HD 6990

Stream Processors

2 x 2048

2048

2048

2 x 1536

Texture Units

2 x 128

128

128

2 x 96

ROPs

2 x 32

32

32

2 x 32

Core Clock

950MHz

1000MHz

925MHz

830MHz

Boost Clock

1000MHz

1050MHz

N/A

N/A

Memory Clock

6GHz GDDR5

6GHz GDDR5

5.5GHz GDDR5

5GHz GDDR5

Memory Bus Width

2 x 384-bit

384-bit

384-bit

2 x 256-bit

VRAM

2 x 3GB

3GB

3GB

2 x 2GB

FP64

1/4

1/4

1/4

1/4

Transistor Count

2 x 4.31B

4.31B

4.31B

2 x 2.64B

PowerTune Limit/TDP

375W

250W+

250W

375W

Manufacturing Process

TSMC 28nm

TSMC 28nm

TSMC 28nm

TSMC 40nm

Architecture

GCN

GCN

GCN

VLIW4

Price

$999

$499

$549

$699

AMD's 7990 is a dual-Tahiti part, placing two of flagship GPUs on a single PCB to make a single card. Each GPU has all 2048 stream processors, 32 ROPs, and full
384-bit memory buses. Joining these GPUs is 6GB of GDDR5
RAM, split up between the two GPUs for the 7900-series
standard of 3GB of VRAM per GPU.

The 7990 supports AMD's PowerTune Boost technology, which is
giving the card a base clockspeed of 950MHz, and a boost
clock of 1000MHz. The memory is clocked at 6GHz, the same as
the 7970GE. This makes the 7990 very close to being a 7970GE
Crossfire setup on a single card, clocked just 50MHz below AMD's single-GPU flagship card.

AMD's 7990 has an official TDP of just 375W.

The card also includes AMD?s ZeroCore power technology,
which was introduced with the GCN family. ZeroCore allows
AMD to almost completely shut off slave GPUs when they're
not in use, which in turn allows AMD to further reduce their
idle power consumption. The biggest benefits are found in
multi-card setups since this allows the fans on those slave
cards to be shut down. Consequently this pushes the idle TDP
of the 7990 down to around 20W.

The 7990?s cooling system is composed of 3 85mm fans
positioned over a pair of heatsinks that run the length of
the card. Around those heatsinks is another grooved
heatplate that serves to channel airflow while drawing heat
off of the RAM, VRMs, and PLX bridge. The overall length of
the card ends up being 12".

The two Tahiti GPUs are joined by 3GB of Hynix 6GHz GDDR5
RAM and a PLX PCIe 3.0 bridge that provides connectivity
between the GPUs and the PCIe connector.

Coming around to the I/O bracket, the 7990 uses the same
output configuration as the 6990: 4 mini-DPs, and 1 DL-DVI
port.

AMD is offering the AMD Radeon HD 7990 graphics card with a
refreshed "Never Settle: Reloaded" AAA game bundle. In
addition to "Crysis 3," "Bioshock Infinite," "Tomb Raider"
and four other titles, AMD is including the "Far Cry 3:
Blood Dragon" by Ubisoft. This new title will also be
offered as a thank-you gift to all previous "Never Settle:
Reloaded" customers and will be loaded automatically onto
existing redemption codes.

AMD is placing the 7990 against NVIDIA?s flagships - the
Nvidia GTX Titan and the GTX 690. The company is setting the
MSRP for the 7990 at $999.

The AMD Radeon HD 7990 graphics card will be available
worldwide in two weeks.